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Re: [Amps] Plate Loading Padding Caps

To: Ham H <>
Subject: Re: [Amps] Plate Loading Padding Caps
From: Herbert Schoenbohm <>
Date: Sat, 22 Dec 2018 11:16:30 -0400
List-post: <>
You might want to check eBay for some used broadcast micas that will handle
this.  They usually come in 500 pf values and will take the current without

Herb, KV4FZ

On Sat, Dec 22, 2018 at 11:05 AM Ham H <> wrote:

> I see this has been talked about before but I have not found the
> information I need.
> I have an Amp Supply LK-500 that has bad load padding caps on 80 Meters.
> The factory caps were 470Pf 5 Kv N3300. I dont believe that was a great
> choice for this application as they are badly heating.
> I know I need class 1 NPO COG caps with 1 KVAR but a source for these
> eludes me. Most web locations have either no data sheets or data sheets
> that give little useful information.
> Where can I find the proper RF transmit caps. I have no room for doorknobs
> so ceramic is my only choice. I have located caps with NPO and COG rating
> at the proper Kv rating but no data sheet so they are a crap shoot.
> These magic small Chinese caps with huge voltage ratings at first glance
> look tempting until you look closely at them and see they wont last long in
> RF use.
> Thanks
> Gary K4MT
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